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How mRNA Vaccines Work

The first COVID vaccine to be rolled out in the U.S., the one from Pfizer and BioNTech, is an mRNA vaccine. The second one probably will be too: Moderna’s vaccine is up for consideration this week. We’ve never had an mRNA vaccine in common use before, so you’re not alone if you’re wondering what the hell this technology is, and whether it has something to do with DNA.